See all articles from Synapse v2 n12
20 PRINT "Enter four numbers between 1 and 20."
30 INPUT a,b,c,d
35 CLS
40 LET t=0
50 LET x1=125+125* SIN (a*t)
60 LET y1=87+87* SIN (b*t)
70 LET x2=125+125* SIN (c*t)
80 LET y2=87+87*SIN (d*t)
90 PLOT x1,y1
100 DRAW x2-x1,y1-y1
110 LET t=t+.01
120 GO TO 50